Re: Extracting the domain of a function, dynamic programming
- To: mathgroup at smc.vnet.net
- Subject: [mg8333] Re: [mg8225] Extracting the domain of a function, dynamic programming
- From: seanross at worldnet.att.net
- Date: Sun, 24 Aug 1997 13:24:49 -0400
- Sender: owner-wri-mathgroup at wolfram.com
John JOWETT wrote: > > --------------DA785FE9E40FF72720FAFD8D > > Hello, I would like to extract the set of values on which a function is > defined. Consider the following toy example (to illustrate a > situation I have while using dynamic programming): > > In:= > Clear[f] > In:= > f:=f1; > f:=f2; > > > I am sure that someone who really understands held expressions > can help me ..... > > (I realise that I could simply accumulate an auxiliary list at > each point where a new value is defined for f but that's not really > satisfactory.) > > Thanks for any efforts, > John Jowett > > -- Try looking at the various elements in your function. Every object in mathematica is a List of some sort. the Zeroeth element is the Head, but depending on how your function is defined, you may find the information in a subsequent element. This is especially true if your function is an interpolation function object or a splined object.